Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996sao..reptv....h&link_type=abstract
Technical Report, Smithsonian Astrophysical Observatory Cambridge, MA United States
Astronomy and Astrophysics
Astrophysics
Solar Atmosphere, Coronal Holes, Heating, High Resolution, Temperature Dependence, Stellar Structure, Solar Corona, Emission Spectra, Spatial Distribution, Space Plasmas, Helium, Magnetic Fields, Thermodynamic Properties, Image Processing, Line Spectra, Noise Storms
Scientific paper
Our approach has focused on exploring the physical characteristics of the coronal heating mechanisms, as manifested in coronal holes, quiet regions and active regions, using different data sets, data analysis techniques and image processing tools. The main results from these studies can be summarized as follows: (1) Temperature inferences in different coronal structures rely on the spectral lines used. Their judicious choice is particularly crucial for reliable inferences in coronal holes. (2) Limits on the helium abundance in the inner corona can be inferred from knowledge of the temperature and density, and their gradients in that region. (3) There exists a characteristic spatial separation of 10"-15" between the substructures within coronal holes, that is independent of the temperature of the emitting plasma, or the large scale overlying magnetic field. (4) Different temperature plasmas coexist at coronal heights regardless of the overlying large scale structure, such as active regions, quiet regions or coronal holes, and within these structures. (5) The spatial distribution of the temporal variability of the coronal emission has a very distinct temperature dependence, with a peak at 100,000 K, and is independent of the structure of the overlying large scale magnetic field. (6) In regard to some of the most spectacular forms of dynamic magnetic events, namely corona mass ejections, nonthermal emission as manifested in the form of type I noise storms observed at 90 cm, can serve as predictors for the occurrence of these events.
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